feat: upgrade edx-drf-extensions to 8.13.0

[robrap]

Attempts fix for ENABLE_FORGIVING_JWT_COOKIES when ENABLE_SET_REQUEST_USER_FOR_JWT_COOKIE is also enabled, as it is in ecommerce.

Note that this won't be put into effect until
ENABLE_FORGIVING_JWT_COOKIES is toggled on
separately.

⛔️ DEPRECATION WARNING

This repository is deprecated and in maintainence-only operation while we work on a replacement, please see this announcement for more information.

Although we have stopped integrating new contributions, we always appreciate security disclosures and patches sent to [email protected]

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Required Testing

• Before deploying this change, complete a purchase in the stage environment.
  (^ We can remove that manual check once REV-2624 is done and the corresponding e2e test runs again)

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